Castellum, Inc. (CTM) ownership: Top institutional holder: VANGUARD GROUP INC ($3.14M). Insider activity: Net Seller (0 buys, 9 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| VANGUARD GROUP INC | 3473227.00 | $3.14M | 2025-12-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3081257.00 | $1.82M | 2026-03-31 |
| GEODE CAPITAL MANAGEMENT, LLC | 944899.00 | $557149.00 | 2026-03-31 |
| Meridian Wealth Management, LLC | 785800.00 | $463229.00 | 2026-03-31 |
| CAPTRUST FINANCIAL ADVISORS | 626100.00 | $369086.00 | 2026-03-31 |
| GOLDMAN SACHS GROUP INC | 353526.00 | $319305.00 | 2025-12-31 |
| VANGUARD FIDUCIARY TRUST CO | 418324.00 | $246811.00 | 2026-03-31 |
| Quadrature Capital Ltd | 217471.00 | $196420.00 | 2025-12-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-03-31 | |
| Sell | null | 2026-03-31 | |
| Sell | null | 2026-03-31 | |
| Sell | null | 2026-03-27 | |
| Sell | null | 2026-03-27 | |
| Sell | null | 2026-03-26 | |
| Sell | null | 2026-03-25 | |
| Sell | null | 2026-03-18 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.